Just watched the episode where Lucy and Mitch got married. I like Miss Ellie, but boy did she overreact. It was obvious that she must have had some built up anger that she was hiding towards Jock and especially Ray.
In a roundabout way, the person she should have been mad at is Gary. He knew how much his mom wanted him to be at Southfork, but for whatever reason, he says in front of Miss Ellie, Jock, Ray and Val about Ray being a Ewing "I guess I feel the best about it because now I don't have to come back and now I know that the ranch is in good hands." Ray then says "I'll always take care of Southfork, you can count on that." Miss Ellie storms away pissed off.
Miss Ellie should have been more mad at Gary and herself for not realizing that ship has sailed. Gary was never coming back to stay.